Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e6f1b5c0070bb7…

MALICIOUS

PDF

69.8 KB Created: 2021-10-04 04:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb9f09b928405bd2208fba985a16e458 SHA-1: eb8bb673c1f2dfc9f1d2c0cbdfd5715c5f6b61a4 SHA-256: f7e6f1b5c0070bb7dc48d8e135bbc27a481a6e987366ee3e85d7d780547d9a16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae977f114---laretifeba.pdf In PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210903_07C9CCB399D37325.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/nadejiluxiwijori.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/dexefaxabojir.pdfIn PDF document text
    • https://eklyps.net/images/file/20269398905.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/vewafe.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/95634676348.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/865513f4ea7891e984e39eb70da11933/6037304741.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/zowidegupazojuduronafeki.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/telijaturugesujifovunul.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/12408338593.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/48238620525.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/95501734135.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/sapetago.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/332e09f20baf948a5d516f7ab748993f/27195613840.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/20635448814.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219317458208.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/50965170027.pdfIn PDF document text
    • https://network-italia.com/file/32303224621.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/lexelodumivasanesid.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/59077931691.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/jujuximaxoziraxoma.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/buzefamutidigilolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+highlight+different+colors+in+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB073 15160 bytes
SHA-256: ed11007318d0f6173f02e02a568293d168ca8b50ed1d1597c54dd45e1a4f62eb
font_01_sfnt_off0000d6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 10816 bytes
SHA-256: bed08da3afd8536c1fc205a16511dbde4728959ecc3abec178e3adba1f2002bf